An Improved Third-Order WENO-Z Scheme

In this paper, we develop an improved third-order WENO-Z scheme. Firstly, a new reference smoothness indicator is derived by slightly modifying that of WENO-N3 scheme proposed by Wu and Zhang (Int. J. Numer. Meth. Fl. 78:162–187, 2015). Then a new term is added to the weights of the developed scheme to further slightly increase the weight of less-smooth stencil. Some numerical experiments are provided to demonstrate that the improved scheme is stable and significantly outperforms the conventional third-order WENO scheme of Jiang and Shu, while providing essentially non-oscillatory solutions near strong discontinuities.

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